Hot spray bar for distributing roadway coating materials



Nov. 8, 1 H. A. CARTWRIGHT 3,234,005

HOT SPRAY BAR FOR DISTRIBUTING ROADWAY COATING MATERIALS 5 Sheets-Sheet 1 Filed Oct. 9, 1964 mm mm E mw m W V! .1 \fi M mm W. 62 M P mm im v m E E L. a 02 $1M R ms mm m Um n 7 @v M n J f 02 8 s 3 Q2 50 M 9. v 8 w @m wuih ATTORNEYS Nov. 8, 1966 H. A. CARTWRIGHT 3,284,006

HOT SPRAY BAR FOR DISTRIBUTING ROADWAY COATING MATERIALS Filed Oct. 9, 1964 5 Sheets-Sheet 3 INVENTOR ATTORNEY$ 1966 H. A. CARTWRIGHT 3,

HOT SPRAY BAR FOR DISTRIBUTING ROADWAY COATING MATERIALS Filed Oct. 9, 1964 5 Sheets-Sheet Z INVENTOR HoRAcE Mnmwmem".

B'llymbaa )Mcaw ATTORNEYS Nov. 8, 1966 H. A. CARTWRIGHT 3,

HOT SPRAY BAR FOR DISTRIBUTING ROADWAY COATING MATERIALS .UO 102 INVENTOR Jim I- nc ACnRTwRmHT 112 M 72 2 OR E I48 1 I24 B 4 2 M at E8 ATTORNEYS HOT SPRAY BAR FOR DISTRIBUTING ROADWAY COATING MATERIALS Filed Oct. 9, 1964 5 Sheets-Sheet 5 V- I f 11? 42 mil i AIHE J mm a- JL Lg eg fl 4:71 ijjl w 5 v a. 76 INVENTOR A44 148 \-\ORnCEl-\.(HRTwRlGHT Wu-1 W ATTORNEYj United States Patent 3,284,006 HOT SPRAY BAR FOR DISTRIBUTING ROADWAY COATING MATERIALS Horace A. Cartwright, 1166 Timberlake Drive, Lynchburg, Va. Filed Oct. 9, 1964, Ser. No. 402,903 19 Claims. (Cl. 239-166) This invention relates to spray bars for distributing roadway coating materials, more particularly bituminous materials such as are used in roadway construction and maintenance.

A particular object is to provide a new hot spray bar construction for circulating fluidized bituminous materials to distributing nozzles and more particularly an improved spray bar for more efficiently handling heavy viscous materials.

Another object of the invention is to provide a hot spray bar having end sections connected to a central section by a new and novel hinge joint which permits a smooth straight through flow between coupled ends of inner and outer pipes when the end sections are aligned with the central section.

Another object of the invention is to provide an improved angle hinge joint between pipe end sections and a central section, embodying opposing plate members having an annular concentric coupling therebetween whereby one plate member rotates with the end section, with respect to the other plate which is maintained stationary upon the adjacent end of the central section.

A still further object of the invention is to provide an improved angle hinge joint of the above described construction, in which is embodied a novel means of drawing the opposing joint parts or plates together to form a tight seal.

Another object of the invention is to provide in a hot spray bar of the character described, a novel spray nozzle construction which is secured in position in a manner which permits its easy and complete removal or detachment from the material conveying pipe.

Still another object of the invention is to provide a new and novel spray nozzle construction with a strainer unit which is attached to the nozzle in such manner as to be removed with the nozzle whereby easy cleaning of the nozzle and the strainer may be effected.

Still another object of the invention is to provide a novel strainer cylinder carried by the spray nozzle and held thereby in position to extend across the material flow space between the outer material conducting pipe and the inner pipe.

A further object of the invention is to provide a novel linkage coupling between the-operating arms of a number of nozzle units whereby disconnection of the operating arms one from the other may be easily effected and reconnection of the arms of the units may also be quickly and easily accomplished.

Other objects and advantages of the invention will become apparent as the description of the same proceeds and the invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings wherein:

FIGURE 1 is a view in top plan of a hot spray bar constructed in accordance with the present invention.

FIGURE 2 is a perspective view of the spray bar, looking at the forward side thereof and showing one end pipe section swung to a vertical position, the view being on an enlarged scale.

FIGURE 3 is a sectional view taken in substantially a horizontal plane through the spray bar structure with parts broken away and with the major portion of the inner pipe in elevation and omitting certain details of construction and showing the paths of flow for material through the pipes.

FIGURE 4 is a view in elevation of the rear side of the spray bar structure.

FIGURE 5 is a bottom View of a portion of the central pipe and one end pipe showing the nozzle holding fingers in position and the linkage coupling between operating arms of the nozzles.

FIGURE 6 is a detailed view on an enlarged scale showing in plan the coupling links between valve operating arms and the means of maintaining the links in position on the arms.

FIGURE 7 is a detailed perspective view illustrating on an enlarged scale the overlapping ends of two lever coupling links in position ready to be engaged with a valve lever carrying stud and showing the manner in which the locking pins are applied.

FIGURE 8 is a view in vertical section taken substantially on the line 8-8 of FIGURE 4 with parts shown in elevation.

FIGURE 8A is a sectional view on an enlarged scale taken substantially on the line 8A-8A of FIGURE 2.

FIGURE 9 is a sectional view taken substantially on the line 99 of FIGURE 8A.

FIGURE 10 is a sectional view taken substantially on the line 10-10 of FIGURE 9 and showing the open position of the valve in which the spray or nozzle slot is at an oblique angle to the spray bar for the lapping of the spray jets.

FIGURE 11 is a sectional view corresponding to FIG- URE 10 and showing the closed position of the valve.

FIGURE 12 is a sectional view in a plane normal to the pipes and showing the details of the valve and strainer unit.

FIGURE 13 is a view, on an enlarged scale, showing partly in elevation and partly in section the details of the angle hinge joint, the section being approximately on the line 1313 of FIGURE 2.

Referring now more particularly to the drawings, the numeral 10 generally designates the spray bar structure of the present invention as a whole which when set up for use is supported for distributing bituminous material or other suitable road coating material, onto a road under construction or in connection with the maintenance of a road.

No structure is here illustrated for supporting the spray bar in operative position or for supplying the material under pressure as such supporting means and material supply means form no part of the present invention and various types of supporting and supply means may be employed such, for example, as is illustrated in my prior Patent No. 2,342,120, issued February 22, 1944.

As is customary, the bituminous road coating material is maintained for distribution from the spray bar structure in heated condition and is capable of free flow under pump pressure, in the conventional manner from the source through the pipe 12 and is returned from the spray bar through the pipe 14.

The pipe 12 is connected to a distributor manifold 16 which approximately parallels the spray bar structure 10 on the forward side thereof which is the side nearest to the road machine to the rear of which the spray bar is attached.

One end of the manifold 16 is connected to a pipe leg 18 while the opposite end of the manifold is connected through a three-way valve 20, with the return pipe 14 and with a pipe leg 22.

For convenience of description, the pipe leg 18 will be referred to as the right leg and the leg 22 will be referred to as the left leg as viewed or considered from a position rearwardly of the spray bar structure.

The three-way valve 20 includes the rotary plug 24 as illustrated diagrammatically in FIGURE 3, having the cross passage 26 and the lateral passage 28.

An operating arm 30 is connected with the plug 24 as illustrated particularly in FIGURES l and 2.

While a simple plug valve has been illustrated in FIG- URE 3 and other figures, it is, of course, understood that any suitable type of distributing valve may be employed whereby to control the flow of material in the required manner to the spray bar.

Also, it is to be understood that the legs 18 and 22 of the material conveying pipes may be reversed in their connections with the hereinafter described units of the spray bar structure if desired.

The spray bar comprises a central section 32 and the right and left end sections 34 and 36.

In the operation of the entire spray bar these end sections are aligned with the central section and the end sections are connected to the central section by angle hinge joints 38 and 40 whereby either or both end sections may be swung from an aligned relationship with the central section to a vertical non-operating position as illustrated in FIGURE 2 at the right end thereof.

Normally for full operation the bar is supported horizontally rearwardly of the carrying vehicle and when less than an entire road surface is to be sprayed or a strip of a width less than the entire length of the full bar is to be sprayed, one or both of the end sections will be elevated to a non-working position and the bituminous material may be then sprayed only from the central section 32 or from the central section and one end section, as will be readily apparent.

In moving the spray bar structure over areas which are not being sprayed and also where it might be desirable to elevate the end sections for clearing objects at the sides of the roadway, the valve will be closed against the passage of material to the distributing leg 22 and in this operation the hereinafter described spray nozzles will also be closed or shut ofi.

Each of the spray bar sections embodies an outer pipe and an inner pipe and such pipes are in spaced relation to provide a flow passage therebetween.

The central section outer pipe is designated 42 and the outer pipe for each of the end sections is designated 44.

The numeral 46 designates the inner pipe for the central section and the numeral 48 designates the inner pipe for each of the end sections.

The flow passage between the inner and outer pipes of the central section is designated 50 and the flow passage between the inner and outer pipes of each end section is designated 52 and, as is shown in FIGURE 3, these flow passages which surround the inner pipes are in direct communication with one another, and the hinge joints are so designed or constructed, as hereinafter pointed out, that when the end sections and central section are aligned an unobstructed clear path is provided for the flow of the bituminous material past or across the joints from the passage 50 to the passages 52.

The outermost ends of the end sections 34 and 36 are closed by end caps 54.

The outermost ends of the inner pipes of sections 34 and 36 terminate short of the caps 54 as best seen in FIGURE 3, thereby leaving sufficient space for reversal of the direction of flow of material issuing from the ends of the inner pipes 48 to pass into the flow passages 50 and 52, when the material is introduced from the feed pipe leg 18 into the inner pipe 46 of the central section. If the connections are reversed as hereinbefore stated so that the inflow is initially into the flow passage 50 then, of course, it would return by entering the outer ends of the inner pipes 48.

When the material is being sprayed from the bar the flow will then be through both legs 18 and 22 to the spray nozzles as will be apparent.

In the structure as here illustrated, the supply pipe leg 18 is connected by the coupling 56 with the inner pipe 46 of the central section, passing through the forward side of the outer pipe 42, as illustrated in FIG- URE 8A. The inner pipe 46 is provided with a suitable opening 58 and the coupling nipple 56 is suitably reduced in diameter to fit in the opening, as indicated at 60 whereby material passing from the coupling nipple Will enter directly into the inner pipe 46 as here illustrated.

The leg 22 of the supply pipe leading from the manifold 16 through the valve 20, is connected with the outer pipe 42 of the central section, by the nipple 62, as best illustrated in FIGURE 2 where the bituminous material is discharged directly into the flow passage 50 as shown by the arrows in the diagrammatic view forming FIGURE 3. This connection of the coupling nipple 62 with the outer pipe 42 is also illustrated on an enlarged scale in FIGURE 8.

Referring now to FIGURE 13, it will be seen that the adjacent ends of the inner pipes 46 and 48 are cut obliquely on a 45 angle. These cut ends of the pipes are designated 64 and the plane of cut is outwardly and downwardly from the top of each pipe. Thus, when the pipes are aligned as illustrated in full and broken lines respectively for the inner pipe 46 and the inner pipe 48, the edges of the two pipes will substantially meet so that the passage through the two pipes will be smooth and unobstructed.

Each angle hinge joint 38, as illustrated in this FIG- URE 13, comprises the two flat, substantially annular plates 66 and 68 which are secured to the obliquely cut end edge surfaces 70 and 72 of the outer pipes 42 and 44, respectively.

The plane of cut for the edges, or end edge surfaces, 70 and 72 is parallel to the plane of cut for the edges, or surfaces, 64 of the inner pipes 46 and 48 and the opposing plane faces of the plates 66 and 68 lie substantially in contact so that these plane faces of the two plates are in, or substantially in, the same plane.

T heannular plates 66 and 68 have openings 74 therein which are of the same size as the open ends of the pipes to which the plates are secured by welding or other suitable means.

The hinge discs 66 and 68 have in their opposing faces the annular channels 76 which are in concentric relation and together form an annular recess in which is positioned a coupling ring 78 of steel or other suitable metal.

The top side of the outer pipe 44 of each outer end section has fixed thereto the rigid post 80, the outer end of which is of reduced diameter to form or provide a pivot stud 82.

The post 80 of each outer section is fixed at a 45 angle to the section and normal to the plane of the opposing faces of the plates 66 and 68 and concentric with the plates, that is, with its longitudinal axis ex tending through the centers of the plates and more especially the center of the coupling ring which connects the opposing faces of the plates together.

The pivot stud 82 extending outwardly from each post 80 has thereon for free rotation thereabout, the externally screw threaded thrust sleeve 84, the inner or lower end of which sleeve is in the form of a nut 86 which rests on the shoulder 88 provided by the outer end of the post.

Each end of the central section 32 has mounted thereon a bracket arm 88. This arm at one end is jointed to a foot portion 90 which rests upon the top of the outer pipe 42 and is secured thereto in a suitable manner, here shown as being by means of cap screws 92.

The body portion 94 is relatively long and is offset rearwardly with respect to the pipe 42 and extends longitudinally of the supporting pipe beyond the adjacent end thereof. At the outer end of the body portion 94 the arm carries the right angular extension 96 which is formed with a threaded opening 98 forming an internally threaded collar in which is threadably engaged the thrust sleeve 84. As this collar is coaxial with the stud 82 and the sleeve surrounding the stud, it will be seen that upon rotation of the sleeve it will be caused to move axially of the stud and when the sleeve is turned in the proper direction to feed it downwardly toward the shoulder 88, it will impose thrust against the end of the post 80 to press the hinge disc 68 toward the disc 66 and thus compress and tighten the coupling 78 in the channels 76, thereby forming a fluid tight joint.

It will also be seen from the foregoing that the outer sections of the spray bar, being connected to their adjacent ends of the central section by the angle hinge joint, may be readily swung from a position in which they are co-extensive with the central section or to a position in which they are perpendicular to and at right angles to the central section.

Maintenance of the inner pipes in their respective sections may be accomplished by means of posts 100 positioned in the flow passages and welded to the inner and outer pipes and located adjacent to the ends of the pipes as shown in FIGURE 13.

The outer pipes of the central and end sections 32, 34 and 36 are provided on the under sides thereof with the longitudinally spaced openings 102, in each of which is located a spray valve assembly.

FIGURE 12 illustrates the spray valve assembly which is located in each of the pipe openings 102 and which assembly is generally designated 104.

Each spray valve assembly comprises a body 106 having an upper end cylindrical portion 108, an intermediate circular portion 110 of larger overall diameter than the upper end portion, and a lower or bottom end flange portion 112 of an overall diameter greater than the diameter of the opening 102 into which the intermediate portion 110 is inserted and the flange portion 112 supports a gasket 114 between its upper face and the adjacent face of the outer pipe 42 thereby forming a tight seal.

The annular intermediate portion 110 of the valve body is also positioned in the lower end of a perforated strainer sleeve 116 which, when the valve is in operative position in the opening 102, receives in the semi-circular cutout 118 in its top edge, the lower half of the inner pipe of the section in which the valve is mounted. The sleeve 116 may be in the form of a tube having apertures 120 therein or it may be in the form of a cylindrical screen of any suitable construction.

The valve body 106 has an axial passage 122 therethrough which, through the upper portion, and for approximately half the length thereof, is flared or conical as indicated at 123 while the lower portion of the passage opens into a recess 124 formed in the lower end of the body and has a materially greater diameter than the passage 122.

The numeral 126 designates the rotary valve plug which has the relatively long lower end stem portion 128 and the conical upper end portion 130, which seats in the conical valve seat forming portion 123 of the axial passage 122.

The valve plug has an axial bore 132 extending therethrough, which may be closed-at its upper end by the threaded plug 134 and a laterally or radially directed inlet port 136 is formed in the conical portion 130 for registry, in the valve open position of the plug, with the port 138 formed in the upper end portion 108 of the valve body.

The lower end of the valve plug has an arcuate slot 140 out therein and transversely thereof which intersects the lower end of the axial passage 132 and the passage 132 has a lining tube 142 fitted therein which extends from the lower part of the radial passage 136 to the top end of the arcuate slot 140.

The spray valve plug 126 has its lower end secured, in a suitable manner, as by means of a set screw 144, for example, in an aperture 146 in one end of an operating arm 143.

Encircling the straight lower end portion 128 of the valve plug is a coiled spring 150 which is compressed between the operating arm 148 and the bottom of the recess 124 into which it extends. Thus the spring maintains the upper conical or frusto-conical end portion 130 of the plug tightly seated in the conical seat 123.

Extending downwardly from the underside of each outer pipe are a number of fixed studs 152, the lower ends of which are screw threaded to receive nuts 154. Each of these fixed studs carries a valve nozzle securing finger bar 156. Each of these bars 156 has an end which extends across and engages the underside of a valve body flange 112 adjacent thereto as is shown in FIGURE 5. Most of these finger bars 156 are between a pair of valves so that each end engages a flange 112 and the supporting studs pass through the finger bars and are forced upwardly by the nuts 154 into tight engagement with the valve flange as will be seen particularly in FIGURES 9 and 13.

The outer end of each valve plug operating arm carries an upstanding headed pin 158 by means of which all of the valve operating arms may be operatively coupled together for unitary actuation to simultaneously open and close the valves, by means of a linkage chain such as that shown in FIGURE 6 and generally designated 160.

The linkage chain consists of a number of link bars 162 which are in the form of elongate fiat strips of metal or other suitable material.

Each of the links, or link bars, 162 has two or more edge slots therein for receiving a pin 158 of a valve plug actuating arm 148.

Each of the links also has formed in the same edge as the slots 164, a relatively long recess 166. Such recesses are adjacent to the ends of the links as shown in FIGURE 6 on the inner side of a pin receiving slot 164. Thus, adjacent ends of the links 162 may be arranged in overlapping relation as shown in FIGURE 7 with two slots 164 registering one with the other so that both slots may receive a pin 158 and in this manner the links are coupled together end to end. In order to maintain the links against disengagement from hte pins 158, each link has formed longitudinally therein a locking wire or locking key receiving bore 168 which extends from the end of the link across the adjacent pin receiving slot and opens into the adjacent recess 166 so that there may be extended through the bore or long hole, a suitable long wire key 170 and the bores or holes are located so that the locking key or wire will be disposed on the outer side of the pin 158 as will be readily seen upon reference to FIGURES 5, 6 and 7.

As the linkage chain is off center from and below the square outer pipe no interference will occur from the hinge joint 38 or 40 where the chain extends thereacross.

One of the links of the chain is provided with an upstanding ear 172 as illustrated in FIGURE 4, to which is attached one end of an operating rod 174.

Mounted upon the top of the pipe 42 of the central section 32 are two brackets designated 176 and 178. The bracket 176 has a horizontal portion which is directed forwardly toward the three way valve 20 as shown in FIG- URE 2 and upon this horizontal portion, designated 180, is mounted a bell crank 182 for turning on the vertical pivot 184, carried by the horizontal portion of the bracket 176.

One arm of the bell crank, designated 186, is connected by a link 188 with the end of the operating arm 30 of the three-way valve, as shown in FIGURES 1 and 2.

The other arm 190 of the bell crank has an end of a link 1S2 connected therewith and this link is connected at its other end to the lower end portion of an upstanding operating lever 29% below the pivot 292 which connects the lever with the upstanding bracket 178 as shown in FIGURE 4.

The bottom end of the lever 290 below the link 192 is pivotally connected at 194 to the operating rod 174 through the medium of the short plate 196.

It will be seen from the foregoing that upon oscillation of the lever 29% the linkage chain connected with the operating arms of the spray valves, will be shifted longitudinally of the spray bar to open and close the valves and at the same time, through the medium of the bell crank 182, the rotary plug of the valve 20 will be turned. Thus, upon moving the lever 290 in one direction to effect the opening of the spray valves, the valve 29 will be turned to the position shown in FIGURE 3 so that upon operation of the mechanism for supplying the bituminous material to the manifold 16, such material will be forced through the legs 18 and 22, passing through one leg into the inner pipe 46 and to the pipes 48 and passing through the other leg into the passage 50 and to the passages 52 in the end sections. The material will flow from the ends of the inner pipes 48 into the outer pipes 44 and the outer pipe 42 from which pipe 42 and pipes 44 it will pass through the strainers 116 to the inlets of the valve plugs for discharge through the discharge slots of the valves.

As will be readily apparent from a consideration of FIGURE 13, when the end sections 34 and 36 of the spray bar are turned into alignment with the central section 32, the flow passages 50 and 52 will be perfectly aligned so that the material when passing across the hinge joints will not be pocketed in any angles or chambered portions of the bar structure. In addition to the fact that this construction permits smooth uninterrupted flow along straight paths from the central section to the end sections, it also avoids the formation of angles or pockets or corners where the material can accumulate and harden when the spray bar is not in service.

The foregoing is also true, of course, of the inner pipes 46 and 48 which are perfectly aligned for the smooth uninterrupted flow of material from the central section to the end sections.

It will also be seen that a very effective means is provided for tightening the seal between the connecting plates 66 and 68 which form the angle hinge joint between the ends of the central section and the end sections.

The spray valve and strainer assembly is also unique in that the entire assembly can be easily and quickly removed for the cleaning or replacement of any one of the spray valves, merely by detaching the appropriate finger plate or finger plates 156.

The novel linkage connection between the valve operating arms 148 provides a quick and easy way of coupling all of the valves together or uncoupling them as it avoids the necessity of manipulating nuts and bolts for connecting the operating arm of each spray valve with a connecting bar. By the employment. of the slotted links 162, a link can be positioned in one operation in operative connection with a number of pins 158 carried by valve operating arms and the link secured by the two wire locking keys 170 at the ends thereof.

From the foregoing it will be seen that there is provided by the present invention a hot spray bar construction having a number of new and novel features which greatly simplify the maintenance of the bar in good working condition and also simplify the jobs of assembling and disassemblingthe parts of the bar structure.

With the material distribution arrangement it will be seen that in starting up equipment in connection with which the spray bar is operated, manipulation of the spray valve lever to a position for closing the spray valves will turn the three-way valve 20 to a position where the heated bituminous material can be circulated first through the pipes to fluidize any material which has been left in the pipes and may have congealed therein, after which the spray valves can all be opened at one time by actuating the lever 290 in the reverse direction so as to supply the material through both legs of the pipeline from the manifold 16 to the distributing valves, as previously described.

When it is necessary to dispense or spray material from the central section only or from the central section and one end section, in which case the end sections would be turned vertically or one end section would be turned vertically, as illustrated in FIGURE 2, it will be understood that the valve actuating lever 290 would be moved so as to close all of the spray. valves when the three sections are in alignment, after which the one end section to be raised or both end sections would have the links which bridge the hinge joints detached at least at the outer ends thereof from the link coupling the nozzles of the end section to be elevated, after which the said end section can be turned to the elevated or raised position, the spray valves thereof being left in closed position as will be readily apparent. It will be seen upon reference to FIGURE 13 that when an end section is swung around to a vertical position the passages 59 and 52 will remain in direct communication with one another and also the inner pipes 46 and 48 will remain in communication and thus the flow of the fluidized coating material will be maintained through the raised section.

As this invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, the present embodiment is therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within the metes and bounds of the claim-s or that form their functional as well as conjointly cooperative equivalents, are therefore intended to be embraced by those claims.

What is claimed is:

1. In a spray bar of the character described, a bar structure comprising inner and outer pipes in spaced parallel relation, means closing the ends of said pipes collectively and establishing communication therebetween, means for supplying one of said pipes with material to be dispensed, means in the said outer pipe for dispensing said material, hinge means coupling a portion of said structure with another portion thereof facilitating folding of said portion relative to said another portion, the respective pipes of the respective portions having oppos ing flat terminal edges lying in parallel planes oblique to the length of the pipes, the said hinge means comprising opposing flat apertured plates secured to the said ends of the said outer pipe only and having plane, opposed parallel functional faces parallel with said planes, seal forming coupling means interposed between said plates, and connecting means bet-ween the said ends of the said outer pipe for facilitating pivotal swinging of said one portion on an axis normal to said planes and intersecting the longitudinal axis of the said outer pipe, the said apertures of said plates coinciding with the said end edges of the said outer pipe.

2. The invention according to claim 1, wherein said connecting means comprises an arm having one end secured to the first said portion and extending across said plates toward said other portion, a pivot stud carried by said other portion and a collar carried by the other end of said arm and having said stud rotatably engaged there- 3. The invention according to claim 2, with means interposed between said other end of said arm and. said otllier portion for forcing one of said plates toward the ot er.

4. In a spray bar of the character described, a bar structure comprising inner and outer pipes in spaced parallel relation, means closing the ends of said pipes collectively and establishing communication therebetween, means for supplying one of said pipes with material to be dispensed, means in the said outer pipe for dispensing said material, said structure comprising a stationary section and at least one movable end section, the said inner pipe being divided in an oblique plane into two end edge opposed parts, the said outer pipe also being divided obliquely into two end edge opposed parts on planes parelleling the first said plane, means forming a hinge joint between the stationary section and the said end section by which the end section may be turned from a position of alignment with the stationary section to right angular relationship therewith, said hinge joint comprising a pair of opposed contiguous plate members secured to the said opposed end edges of the said outer pipe only and having aligned apertures coinciding with the latter said end edges, and means coupling the said stationary and movable sections together for facilitating the said turning of the latter section on a pivotal axis normal to said planes and intersecting the longitudinal center of the outer pipe.

5. The invention according to claim 4, wherein said coupling means includes means for drawing said hinge joint plates toward one another.

6. The invention according to claim 4, wherein the last stated means comprises a post secured to the top of the movable end section and extending therefrom on said axis, an arm secured at one end to the top of the stationary section and extending across said plate members in laterally offset relation tothe stationary section and terminating at its other end in an angled inturned extension having an opening forming a collar, said collar being internally screw threaded and coaxial with said post, the post terminating in an axially extending stud, an externally threaded sleeve encircling and freely rotatable on said stud and threaded in said collar, said sleeve havin a polygonal end portion bearing against the end of the post for facilitating rotation of the sleeve for forcing one plate toward the other.

7. The invention according to claim 1, wherein said means in said outer pipe for dispensing material comprises a series of rotary plug spray valves having downwardly directed discharge openings, means linking said valve plugs together whereby they may be turned in unison, means for actuating said linking means, and means forming a detachable element of said linking means bridging said hinge means.

8. The invention according to claim '7, with a strainer means encircling the inlet ends of the rotary plugs within the said outer pipe and interposed between the said outer pipe and the inner said pipe.

9. The invention according to claim 4, wherein said means in said outer pipe for dispensing material comprises a eries of rotary plug spray valves including rotary plugs having inlet ends and downwardly directed discharge openings, means linking said valve plugs together whereby they may be turned in unison, means for actuating said linking means, and means forming a detachable element of said linking means bridging said hinge means.

10. The invention according to claim 9, with a strainer means encircling the inlet ends of the said rotary plugs within the outer pipe and interposed :between the said outer pipe and the said inner pipe.

11. In a spray bar of the character described, a bar structure comprising inner and outer pipes in spaced parallel relation, means closing the ends Olf said pipe collectively and establishing communication therebetween, conduit means including a fee-d line for supplying from a source, material to be dispensed and having spaced leg portions, one leg portion communicating with the said outer pipe and the other leg portion communicating with the said inner pipe, a. material return pipe, a three-way valve operatively connecting said return pipe with one of said leg portions and with said feed line, means in the said outer pipe for discharging material therefrom, hinge means coupling a portion of said structure with another portion thereof facilitating folding of said portion relative to said other portion, the respective inner and outer pipes of the respective portions having opposing end edges lying in parallel planes oblique to the length of the pipes, the said hinge means comprising opposing apertured plates secured to the said ends of the said outer pipe parallel with said planes, seal tormin-g means independent of and between said plates, and connecting means between the said ends of the said outer pipe for permitting pivotal swinging of said one portion on an axis normal to said planes and intersecting the longitudinal axis of the said outer pipe, the said apertures of said plates coinciding with the end edges of the said outer pipe.

12. In .a spray bar of the character described, a bar structure comprising inner and outer pipes in spaced parallel relation, means closing the ends of said pipes collectively and establishing communication therebetween, means for supplying one of said pipes with material to be dispensed, said outer pipe having a lower side, a plurality of spray valves carried by the said outer pipe, each of said spray valves comprising a body portion extending upwardly through an opening in the lower side of the said outer pipe, a valve plug in said body portion having an upper end inlet communicating with the interior of the said outer pipe to receive material therefrom and said valve plug body portion [having a bore therethrough leading to a downwardly directed outlet, material straining means between said plug upper end inlet and the interior of the said outer pipe, an operating arm connected with said plug, means connected with the arms of the said plurality of valves for rotating the plugs thereof, and means carried by the said outer pipe securing the valves in their respective openings.

13. The invention according to claim 12, wherein said valve plug body portion has a flange encircling the lower end thereof and opposing the said outer lower side of the said outer pipe, the said body portion being freely insertable in the said opening in the said lower side of said outer pipe, and means carried by the said outer pipe and engaging said flange and securing the valve body in the said opening.

14. The invention according to claim 13, with a gasket encircling the valve body and interposed between the said flange and the said lower side of the outer pipe.

15. The invention according to claim 12, wherein said material straining means comprises a for-aminous cylinder encircling an upper end portion of the valve body and supported thereon and extending upwardly into the said outer pipe and engaging the adjacent underside of the said inner pipe.

16. The invention according to claim 12, wherein said valve plug has an upper end portion substantially in the form of an inverted frustum of a cone engaging a corresponding'ly ltormed seat in the upper end of the valve body and a straight lower end portion extending below the valve body and to which the said operating arm is attached, and a coil spring encircling the said straight low-er end portion of the valve plug and compressed between a part of the valve body and the arm and drawing said upper end portion of the plug into engagement with the said seat.

17. The invention according to claim 12, wherein the said means securing the valves in their respective openings comprises threaded stud members secured to the lower side of the said outer pipe and extending downwardly between adjacent pairs of valves and finger members detachably secured to said studs and extending in substantially parallel relation with the lower side of the said outer pipe and having end portions engaging the lower ends of the valve bodies and pressing the valve bodies upwardly intoposition in their respective openings.

18. The invention according toclaim 12, wherein said means connecting the arms of the plurality of valves for rotating the plugs, comprises a headed pin carried by each valve plug operating arm, and a linkage chain consisting of a series of flat, relatively long link bars each having a plurality of slots in a longitudinal edge thereof in each of which slots a headed pin is engaged, detachable means carried by each link bar adjacent to its ends and References Cited by the Examiner engaging a-cross a headed pin ;on the side thereof remote UNITED STATES PATENTS \from the closed end of the pm slot, and a lever means carried by the said spray bar structure and operatively 2,342,120 2/1944 Cartwright 239-130 coupled with a link of ma chm-m 5 3,001,720 9/1961 Cartwright 239-430 19. The invention according to claim 18, wherein the $120327 2/1964 Ho'land 239130 said detachable means carried by each link bar consists FOREIGN PATENTS of a wire key engaged in apertures in the link bar and said 701,780 12/1953 Great Britain wire key is aligned with another Wire key extending across a pin receiving slot. 10 EVERETT W. KIRBY, Primary Examiner. 

1. IN A SPRAY BAR OF THE CHARACTER DESCRIBED, A BAR STRUCTURE COMPRISING INNER AND OUTER PIPES IN SPACED PARALLEL RELATION, MEANS CLOSING THE ENDS OF SAID PIPES COLLECTIVELY AND ESTABLISHING COMMUNICATION THEREBETWEEN, MEANS FOR SUPPLYING ONE OF SAID PIPES WITH MATERIAL TO DE DISPENSED, MEANS IN THE SAID OUTER PIPE FOR DISPENSING SAID MATERIAL, HINGE MEANS COUPLING A PORTION OF SAID STRUCTURE WITH ANOTHER PORTION THEREOF FACILITATING FOLDING OF SAID PORTION RELATIVE TO SAID ANOTHER PORTION, THE RESPECTIVE PIPES OF THE RESPECTIVE PORTIONS HAVING OPPOSING FLAT TERMINAL EDGES LYING IN PARALLEL PLANES OBLIQUE TO THE LENGTH OF THE PIPES, THE SAID HINGE MEANS COMPRISING OPPOSING FLAT APERTURED PLATES SECURED TO THE SAID ENDS OF 